Machine tool

Abstract

A machine tool includes a camera fixed to a predetermined imaging area and for imaging a tool inserted into the imaging area, a tool holding portion to which a tool is attachable, and a machining control portion for controlling the tool holding portion in accordance with a machining program and machining a workpiece with the tool. The machining control portion moves the tool toward the imaging area after rotating the tool to image the tool.

What is claimed is: 
     
         1 . A machine tool comprising:
 a camera fixed to be capable of imaging a predetermined imaging area and for imaging a tool located in the imaging area;   a tool holding portion to which a tool is attachable; and   a machining control portion for controlling the tool holding portion in accordance with a machining program and machining a workpiece with the tool,   wherein the machining control portion moves the tool toward the imaging area to image the tool after rotating the tool.   
     
     
         2 . The machine tool according to  claim 1 , wherein the machining control portion moves the tool holding portion toward a predetermined tool standby position different from an imaging position where a tool is positioned when the tool is to be imaged, rotates the tool at a speed equal to or higher than a predetermined rotation speed at the standby position, and subsequently moves the tool toward the imaging area to image the tool. 
     
     
         3 . The machine tool according to  claim 2 , further comprising a cover control portion for closing a shutter located between the imaging area and the standby position during rotation of the tool, and opening the shutter after an end of the rotation of the tool,
 wherein the machining control portion moves the tool toward the imaging area after the shutter is opened.   
     
     
         4 . The machine tool according to  claim 3 , further comprising a first cover for covering a lens of the camera,
 wherein the cover control portion opens the first cover after the shutter is opened after an end of the rotation of the tool.   
     
     
         5 . The machine tool according to  claim 1 , wherein at a time when the camera and the tool are relatively moved, a first partial image of the tool is captured when a leading end of the tool is detected in an imaging range, and a plurality of partial images of the tool are captured in association with relative movement of the tool. 
     
     
         6 . The machine tool according to  claim 1 ,
 wherein the machining control portion moves the tool toward the imaging area when a predetermined measurement command is to be executed in the machining program, and   the machining control portion moves the tool toward the imaging area after rotating the tool when the measurement command is to be executed, even if the machining program does not include a command explicitly instructing a rotational motion of the tool before imaging of the tool.   
     
     
         7 . The machine tool according to  claim 1 , further comprising a tool check unit for detecting a plurality of edge points indicating a profile position of the tool from captured images of the tool and forming tool shape data indicating a profile of the tool on the basis of the edge points. 
     
     
         8 . The machine tool according to  claim 7 ,
 wherein the machining control portion rotates the tool when inserting the tool to the imaging area, and   the tool check unit captures a plurality of images respectively corresponding to a plurality of rotation angles, detects an edge point from each of the captured images, and forms the tool shape data as three-dimensional point group data on the basis of the edge points detected correspondingly to the rotation angles, respectively.